SEOUL, South Korea — Travis King, the U.S. Army private who intentionally ran across the border into North Korea this summer, is back in U.S. custody, an American official said Wednesday, shortly after the isolated East Asian country said it would expel the soldier. “U.S. officials have secured the return of Private Travis King from the Democratic People’s Republic of Korea," Pentagon spokesman Brig. Gen. Patrick Ryder said in a statement. He went on to thank the U.S. military personnel who worked to "bring Private King home," as well as the governments of Sweden and China. King, 23, bolted across...